Fragile X syndrome: Diagnostic and carrier testing

Fragile X testing in a diagnostic cytogenetics laboratory.

Chromosome results obtained from 1012 patients referred with developmental delay without known cause within the three years 1985 to 1987 are reported. G banding analysis and assessment of 70 cells for fragile X gave abnormal results in 84 cases: fragile X in 31 patients and other abnormalities in 53 patients. A further 16 sibs expressing the fragile X were detected in family studies originating...

Fragile X syndrome and fragile X-associated disorders

Fragile X syndrome (FXS) is caused by a full mutation on the FMR1 gene and a subsequent lack of FMRP, the protein product of FMR1. FMRP plays a key role in regulating the translation of many proteins involved in maintaining neuronal synaptic connections; its deficiency may result in a range of intellectual disabilities, social deficits, psychiatric problems, and dysmorphic physical features. A ...

Genetic Testing for FMR1 Mutations (Including Fragile X Syndrome)

Patient Selection Criteria Coverage eligibility will be considered for fragile X mental retardation 1 (FMR1) mutations the following patient populations:  Individuals of either sex with intellectual disability, developmental delay, or autism spectrum disorder (see Policy Guidelines ◊ ).  Prenatal testing of fetuses of known carrier mothers (see Policy Guidelines ◊ ).  Affected individuals or...

The fragile X syndrome.

We have begun to appreciate that the extent of this disorder is much wider than merely mental retardation. It is also a common cause of learning and emotional problems in mildly affected female carriers with normal IQs. These children present an enormous challenge to all child-care providers, be they in medicine, education, or in various therapy disciplines. Early identification is essential, a...

Fragile X syndrome.